Version:           KDE 3.4 (using KDE KDE 3.4.0)

1. I've composed an e-mail and pressed send.
2. While the e-mail was still in outbox, I went to that folder.
3. The e-mail was still there, the status bar was indicating activity
4. It was automatically shown in the preview area, because it was alone in outbox
5. A "send dispose notification" popped at the same time, because I have that option enabled.
6. The e-mail poof-ed from outbox, and Kontact poof-ed with it.
End of story (ups, forgot to save the backtrace - I've remembered only now)

From my point of view, this looks like some kind of resource sharing thing (when something is deleted but still used in some other place).

Other than that, there might be something else strabge in this behaviour:
* "dispose notification" dialog popping for messages in outbox (shouldn't happen, IMO)
but I'm not sure wether this worth reporting separately or they'll be fixed with this bug, because they're actually the problem.